[PATCH] x86: use 'rep bsf' syntax when assembler supports it

[Uros Bizjak]

On Mon, Jul 2, 2012 at 8:39 PM, Roland McGrath <mcgrathr@google.com> wrote:
> On Sun, Jul 1, 2012 at 1:08 AM, Uros Bizjak <ubizjak@gmail.com> wrote:
>> Based on the observation above, the patch is OK for mainline, but
>> please also handle "rep nop" case.
>
> Here's the new version of the patch that does that.  Note that someone
> needs to commit this for me, since I am not empowered to do it myself.
>
> gcc/
> 2012-07-02  Roland McGrath  <mcgrathr@google.com>
>
>         * configure.ac (HAVE_AS_IX86_REP_LOCK_PREFIX): Also require that the
>         assembler accept 'rep bsf ...', 'rep bsr ...', 'rep ret', and 'rep nop'.
>         * configure: Regenerated.
>         * config/i386/i386.md (simple_return_internal_long): Use %;
>         (ctz<mode>2): Likewise.
>         (*pause): Likewise.

The patch is OK.

I have committed it to the mainline SVN.

Thanks,
Uros.